| 前陆盆地异常流体压力: 地质作用及其增压效率 |
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| 引用本文： | 罗晓容.前陆盆地异常流体压力: 地质作用及其增压效率[J].地质科学,2013,0(1):32-49. |
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| 作者姓名： | 罗晓容 |
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| 作者单位： | 中国科学院地质与地球物理研究所油气资源重点实验室 北京 100029 |
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| 摘 要： | 在前陆盆地形成过程中,强烈挤压构造应力场和特殊的盆-山关系造成极为复杂的沉积环境和构造形变,多种地质作用都可能对地层内异常流体压力的产生及演化起到十分重要的作用。通过对准噶尔盆地南缘地区中段的地质条件及压力分布的分析,利用数值盆地模型方法,模拟分析了在前陆盆地构造挤压和盆地沉降过程中压实作用、断裂开启、褶皱、剥蚀等地质过程对流体压力的作用和影响,定量讨论了压力异常的成因机制及其效率。模拟分析结果表明,构造应力在水平方向上派生的侧向压实作用、强烈的褶皱作用及伴随的快速沉积-剥蚀作用等是前陆盆地中特有的增压作用,都可造成较高压力异常。准噶尔盆地南缘中新生界地层中广泛分布的高异常压力是新生代以来,特别是第四纪以来,在快速的压实作用、构造挤压作用所形成的高地层压力背景下,叠加了近期因断裂活动和背斜构造快速形成所引起的他源高压而形成的。
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| 关 键 词： | 前陆盆地 挤压应力场 构造形变 异常压力 成因机制 准南缘 |
| 收稿时间： | 2012-10-28 |
| 修稿时间： | 2012-10-28; |
Overpressuring in foreland basins:Geological affects and their efficiency |
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| Luo Xiaorong.Overpressuring in foreland basins:Geological affects and their efficiency[J].Chinese Journal of Geology,2013,0(1):32-49. |
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| Authors: | Luo Xiaorong |
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| Institution: | Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | During the development of foreland basins,the intensive compressive stresses and typical orogen-basin relationship have resulted in complex sedimentary environments and structural deformations.And correspondingly,many geological activities may play important roles in pore pressure evolution.In this paper,the geological conditions favorable for overpressure generation and distribution of overpressures were analyzed.And then effects of some overpressuring mechanisms were simulated by using numerical basin modeling method,based on our understandings about various geological processes occurred in foreland basins,such as compaction,fault opening,folding and erosion,etc.Simulated results demonstrate that lateral compaction caused by compressive tectonic stress,the intensive folding,as well as corresponding rapid deposition and erosion,are the typical geological effects that may cause high overpressures in a foreland basin.The extremely high overpressure in the southern margin of Junggar Basin,NW China,may be interpreted to have resulted from superimposition of allogenically-transmitted pressure along faults and dipping permeable sandstones under the background of high pressure generated by compaction and tectonic compression. |
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| Keywords: | Foreland basin Compressive stress field Structure deformation Overpressures Origin and mechanism The southern margin of Junggar Basin NW China |
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